Limited Size MIMO Antenna Systems and Mutual Coupling Challenge

Limited Size MIMO Antenna Systems and Mutual Coupling Challenge

Nassrin Elamin (International University of Africa, Sudan) and Tharek Rahman (Universiti Teknologi Malaysia (UTM), Malaysia)
DOI: 10.4018/978-1-4666-8645-8.ch006
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The wireless communication high data rate is achievable by installing more than one antenna in receiver and transmitter terminals as MIMO antenna. In order to obtain the MIMO gain (Envelope Correlation Coefficient (ECC) = 0.5), the antenna elements must be at least separated by a distance of 0.5? (? is the operating wavelength of 0.7~3.8 GHz which is the frequency range of most of the current wireless communication applications). This value is big relative to limited sizes devices. A practical MIMO antenna should have a low signal correlation between the antenna elements and good matching features for input impedance. Moreover, MIMO system performance can be improved by reducing mutual coupling between closely spaced antenna elements. Miniature high isolated MIMO antenna system has been presented in this chapter; also many MIMO antenna systems were analyzed and categorized based on the implemented isolation techniques. Furthermore several MIMO antenna evaluation methods have been discussed.
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1. Isolation Methods In Mimo Implementation

MIMO technique proposed design suggests more than one antenna elements in transmitter and receiver terminals to improve the channel capacity in a high multipath environment (Jamil, 2011, p. 1, Votis, 2010, p. 350, & MinSeok, 2010, p. 1,). In this section 4-element MIMO antenna design is classified and analyzed based on the methods used for reducing the coupling and increasing the isolation between MIMO antenna elements. The isolation techniques used for classification include CPW-feeding technique, Direct Connection of the Antenna Elements (DCAE), Orthogonal Polarization (OP), true polarization diversity (TPD), and Ground Plane Structure for Controlling mutual coupling (GPSC). Others are Band Stop Filter (BSF) insertion, introducing of Resonating Structures Near the Antennas (RSNA), and Use of Meta-materials (UM). Table 1 summarizes existing MIMO designs, as found in the literatures.

Table 1.
MIMO antenna system models
RefAntenna Size (mm)Frequency (GHz)Isolation Technique\S12\(dB)
(Chen, 2006, p.2027)53×27.52.4CPW-fed28
(Darvish, 2012, p. 1)54×521.9,2.4,3.5&5.5CPW-fed22
(Fakhr, 2009, p. 147)180×1722.4/5.2CPW-fed23
(Han, 2010, p. 2551)68×270.75DCAE17
(Ssorin, 2011, p. 319)20×602.5,2.7DCAE15
(Yuan, 2011)153×830.7, 1.7, 2.1, 2.3, & 2.5OP13
(Han, 2009, p. 1)108×480.7,& 1.9-3BSF24
(Min, 2005, p. 125)66×655.15-5035RSNA20
(Sharawi, 2013, p. 247)100×50827-853&2.3-2.98UM18.9
(Youngki, 2011, p. 231)90×503.6UM15
(Karimian, 2012, p. 2348)77×772.4GPC16
(Costa, 2011, p. 1200)114×1142.4(CXETS)25
(Antonino, 2011, p. 2022)100×1002.4Excited ports control20
(Jaejin, 2011, p. 603)110×550.7GPC26
(Qinjiang, 2010, p. 1319)95×552.5DCAE15
(Thaysen, 2007, p. 540)100×401.8GPC16

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